Our 20month old has always loved water -even asking for more of it in the syringe when we gave meds when he was younger.  He always has access to his sippy cup of water -and only recently started liking apple juice -(still doesn’t drink milk but gets lots of dairy from foods during the day).  I had wondered too if this was CAH related or just how he is.  I’ll be sure to pay more special attention to this as he’s more active and in school.